public class SystemUtil {
    public static boolean isAdmin(String userId) {
        return userId == "admin";
    }

    public static void func(String s){
        System.out.println(s);
    }
    public static void main(String[] args) {
        System.out.println(isAdmin("Admin"));


        String s="qwe";
        System.out.println(s);
        func(s);
    }
}